<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://unpkg.com/vue@next"></script>
</head>

<body>
  <div id="app">
    <p v-if="isActive">v-if truetruetruetrue</p>
    <p v-else>v-if false</p>
    <p v-show="isActive">v-show</p>
    <button @click="switchAction">切换状态</button>
    
    <p v-if="num==0">num为0</p>
    <p v-else-if="num==1">num为1</p>
    <p v-else>num非0非1</p>
    <button @click="changeNum(0)">num为0</button>
    <button @click="changeNum(1)">num为1</button>
    <button @click="changeNum(2)">num非0非1</button>

  </div>


  <script>
    const app = Vue.createApp({
      data() {
        return {
            isActive:true,
          num:0
        }
      },
      methods:{
        switchAction(){
            this.isActive=!this.isActive
            console.log('this.isActive',this.isActive);
        },
        changeNum(number){
            this.num=number
        }
      }
    })
    app.mount('#app')
  </script>
</body>

</html>